I was reading a text about differential geometry and I noticed this example:
$xdy\wedge dz+ydz\wedge dx+zdx\wedge dy = (dx\wedge dy\wedge dz)⌋R$
where $R:\mathbb{R}^3\rightarrow\mathbb{R}^3, R(x,y,z)=(x,y,z)$.
I don't quite get the meaning of the symbol $⌋$ since my class hasn't covered this, would anyone like to add some detail?